332 CYPERACEAE. 
120. Carex setifdlia (Dewey) Britton. Bristle-leaved Sedge. (Fig. 790.) 
Coes alba var. setifolia Dewey, Am. Journ, Sci. 11: 316. 
1826. 
pa eburnea Boott.; Hook. Fl. Bor. Am. 2: 226. pi. 225. 
1840. 
Glabrous, pale green, culms filiform, smooth, weak, 
4/-15’ long. Leaves filiform, shorter than the culm, 
less than \%/’/ wide; bracts reduced to bladeless, 
sheaths 2/’-5’’ long; staminate spikes solitary, ses- 
sile or very nearly so, 3/’-4’’ long; pistillate spikes 
2-4, erect, slender-stalked, 2’’-4’’ long, rather less 
than 1’’ thick, loosely few-flowered, the upper com- 
monly overtopping the staminate, the lower one 
sometimes distant; perigynia oblong, pointed at 
both ends, 3-angled, 1// long, %’ or less thick, 
polished and nearly black when mature, very faintly 
few-nerved, tapering into a short entire beak; scales 
ovate, obtuse or the lower acute, thin, hyaline, 
shorter than the perigynia; stigmas 3. 
In dry sandy or rocky soil, preferring limestone rocks, New Brunswick to the Northwest Ter- 
ritory, south to Pennsylvania, Kentucky and Nebraska, May-July. 
121. Carex concinna R. Br. Jow North- 
ern Sedge. (Fig. 791.) 
Carex concinna R., Br. Frank, Journ. 763. 1823. 
Culms filiform, smooth, 2/-6’ tall. Leaves about 
1/’ wide, flat, pale green, much shorter than the 
culm; bracts reduced to green bladeless sheaths or 
the lower one with an erect subulate blade 3//-6’’ 
long; staminate spike solitary, sessile; pistillate 
spikes 1-3, sessile and clustered or the lower one 
somewhat distant and short-stalked, erect, 2//-4/’ 
long, about 1/’ thick, compactly few-flowered; peri- 
gynia oblong-ovoid, 3-angled, pubescent, short- 
beaked, few-nerved, about twice as long as the ovate 
obtuse or subacute green or purplish scales; stigmas 3. 
In rocky places, Quebec and Ontario to British Colum- 
bia. Summer. 
122. Carex Richardsoni R. Br. Richardson's Sedge. (Fig. 792.) 
Carex Richardsoni R. Br. Frankl. Journ. 751. 1823. 
Culms slender, rough, erect, 4/-12’ tall. Leaves 
flat, about 1’’ wide, the basal shorter than or some- 
times equalling the culms, those of the culm very 
short; bracts bladeless, sheathing, 14 ’-1’ long, usually 
brown-purple with a white hyaline acute summit; 
staminate spike solitary, short-stalked; pistillate 
spikes I or 2, erect, narrowly cylindric, short-stalked, 
4’’-9’’ long, compactly several-flowered, close to- 
gether, their stalks partly or wholly enclosed in the 
sheaths; perigynia obovoid, pubescent, about 1’ long, 
minutely beaked; scales mostly longer than the peri- 
gynia, ovate, obtuse or subacute, purple, conspicu- 
ously white-margined; stigmas 3. 
In dry soil, Ontario to the Northwest Territory and 
British Columbia, south to western New York, Illinois 
Michigan and South Dakota. Summer, 
